/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ir, native, HomeCheckIrHint } from 'qvog-dsl';

const SEVERITY = 2;
const DOC_PATH = 'docs/no-null-access-dsl.md';
const DESCRIPTION = 'When accessing an external object or its methods and properties, you must first check whether the object is null, or whether the object contains the method or property being called.';

export default native<HomeCheckIrHint>({ use: 'ir' })()
    .match((stmt): stmt is ir.ArkAssignStmt => {
        return stmt instanceof ir.ArkAssignStmt;
    })
    .when((stmt) => {
        const rightOp = stmt.getRightOp();
        if (rightOp instanceof ir.ArkInstanceFieldRef) {
            const type = rightOp.getBase().getType();
            // console.log(type);
            return type instanceof ir.UnknownType || 
                type instanceof ir.UndefinedType || 
                type instanceof ir.NullType;
        }
        return false;
    })
    .report({
        severity: SEVERITY,
        description: DESCRIPTION,
        docPath: DOC_PATH,
    });
